This mobile phone program is to determine the temperature change of infinite slab, infinite cylinder and sphere shaped food products. It solves the required partial differential equation using the 3rd kind and symmetry boundary conditions with uniform temperature initial condition.

As I indicate in my seminars `Bi=λ tan(λ)` is my favorite equation. When I started writing codes for mobile phones, with a suggestion from Turgay (graduate of the Department of Food Engineering at the University of Mersin in 2008), this equation was the first thing that came to my mind.